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NaLa(CO3)(2) hybridized with Fe3O4 for efficient phosphate removal: Synthesis and adsorption mechanistic study
Hao, Haotian; Wang, Yili; Shi, Baoyou
2019-05-15
Source PublicationWATER RESEARCH
ISSN0043-1354
Volume155Pages:2020-01-11
AbstractEffectively eutrophication control and phosphate recovery have received increasing attention in recent years. In this study, a regenerable magnetic NaLa(CO3)(2)/Fe3O4 composites (MLC) which includes a novel phosphate-binding lanthanum species NaLa(CO3)(2) hybridized with Fe3O4 nanoparticle was developed through a modified solvothermal method for phosphate removal from contaminated water. Based upon preliminary screening of synthesized MLC with different La-to-Fe molar ratios in terms of phosphate adsorption capacity and synthetic product yield, a MLC composite with a La-to-Fe molar ratio of 2:1 (MLC-21) was selected for further characterization and evaluation. MLC-21 exhibits a high magnetic separation efficiency of 97%, high phosphate adsorption capacity of 77.85 mg P/g, wide applicable scope of pH ranging from 4 to 11, excellent selectivity for phosphate in the presence of competing ions (Cl-, NO3-, HCO3-, SO42-, Ca2+, and Mg2+), good reusability with above 98% desorption efficiency using NaO-H-NaCl mixture and 83% adsorption capacity remained during five recycles. Furthermore, a real effluent wastewater with phosphate concentration of 1.96 mg P/L was used to verify the performance of MLC-21 through a magnetic separation integrated system (AMSS). By using the response surface methodology (RSM), the optimum parameters were determined to be 0.26 g/L of adsorbent dosage, 26.28 h of adsorption time and 24.12 min of magnetic separation time for meeting the phosphate emission standard of 0.5 mg P/L The phosphorus in three representative eutrophic water bodies can be efficiently reduced to below 0.1 mg P/L by MLC-21 adsorption at different dosages. Electrostatic attraction and the inner-sphere complexation between La(HCO3)(2)(+)/La(CO3)(2)(-) and P via ligand exchange forming LaPO4 were responsible for the phosphate adsorption mechanisms of MLC. (C) 2019 Elsevier Ltd. All rights reserved.
Department中国科学院饮用水科学与技术重点实验室
KeywordEutrophication Magnetic separation Lanthanum carbonate Phosphate Adsorption
Document Type期刊论文
Identifierhttp://ir.rcees.ac.cn/handle/311016/43491
Collection中国科学院饮用水科学与技术重点实验室
Affiliation1.Beijing Forestry Univ, Beijing Key Lab Source Control Technol Water Poll, Coll Environm Sci & Engn, 35 Tsinghua East Rd, Beijing 100083, Peoples R China
2.Chinese Acad Sci, Res Ctr Ecoenvironm Sci, Key Lab Drinking Water Sci & Technol, 18 Shuangqing Rd, Beijing 100085, Peoples R China
3.Univ Chinese Acad Sci, 19 Yuquan Rd, Beijing 100049, Peoples R China
Recommended Citation
GB/T 7714
Hao, Haotian,Wang, Yili,Shi, Baoyou. NaLa(CO3)(2) hybridized with Fe3O4 for efficient phosphate removal: Synthesis and adsorption mechanistic study[J]. WATER RESEARCH,2019,155:2020-01-11.
APA Hao, Haotian,Wang, Yili,&Shi, Baoyou.(2019).NaLa(CO3)(2) hybridized with Fe3O4 for efficient phosphate removal: Synthesis and adsorption mechanistic study.WATER RESEARCH,155,2020-01-11.
MLA Hao, Haotian,et al."NaLa(CO3)(2) hybridized with Fe3O4 for efficient phosphate removal: Synthesis and adsorption mechanistic study".WATER RESEARCH 155(2019):2020-01-11.
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